Rainbows! doesn't have as many Unix-only idioms as Unicorn, but there
are still bugfixes like commit 71b4507755f2bd279adb14e6cdc90e1380efa247
that could warrant more explanation.
I'll probably cover various concurrency-related topics in later posts,
but it won't be the main topic.
The original announcement is here:
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/387563
--
Eric Wong